DOC: Remove invalid CMake escape characters

From the Configuring and Building ITK section. These are passed through
in the minted code listing.

Author: thewtex

SoftwareGuide/Latex/Introduction/Installation.tex

@@ -575,8 +575,8 @@ \section{Using ITK as an External Library}%
 \small
 \begin{minted}[baselinestretch=1,fontsize=\footnotesize,linenos=false,bgcolor=ltgray]{cmake}
 set(MINIMUM_ITK_VERSION 5.4)
-find_package(ITK \${MINIMUM_ITK_VERSION} REQUIRED COMPONENTS Module1 Module2)
-include(\${ITK_USE_FILE})
+find_package(ITK ${MINIMUM_ITK_VERSION} REQUIRED COMPONENTS Module1 Module2)
+include(${ITK_USE_FILE})
 \end{minted}
 \normalsize
 
@@ -585,14 +585,14 @@ \section{Using ITK as an External Library}%
 \small
 \begin{minted}[baselinestretch=1,fontsize=\footnotesize,linenos=false,bgcolor=ltgray]{cmake}
 set(MINIMUM_ITK_VERSION 5.4)
-find_package(ITK \${MINIMUM_ITK_VERSION} REQUIRED
+find_package(ITK ${MINIMUM_ITK_VERSION} REQUIRED
   COMPONENTS
     MorphologicalContourInterpolation
     ITKSmoothing
     ITKIOImageBase
     ITKIONRRD
     )
-include(\${ITK_USE_FILE})
+include(${ITK_USE_FILE})
 \end{minted}
 \normalsize
 
@@ -605,7 +605,7 @@ \section{Using ITK as an External Library}%
 \small
 \begin{minted}[baselinestretch=1,fontsize=\footnotesize,linenos=false,bgcolor=ltgray]{cmake}
 ExternalProject_Add(ITK
-      GIT_REPOSITORY \${git_protocol}://github.com/InsightSoftwareConsortium/ITK.git"
+      GIT_REPOSITORY https://github.com/InsightSoftwareConsortium/ITK.git"
       GIT_TAG "<tag id>" # specify the commit id or the tag id
       SOURCE_DIR <ITK source tree path>
       BINARY_DIR <ITK build tree path>
@@ -648,7 +648,7 @@ \subsection{Hello World!}%
 project(HelloWorld)
 
 set(MINIMUM_ITK_VERSION 6.0)
-find_package(ITK \${MINIMUM_ITK_VERSION} REQUIRED)
+find_package(ITK ${MINIMUM_ITK_VERSION} REQUIRED)
 
 # Generate the ITK factory registration code.
 itk_generate_factory_registration()